Jump to content
SAU Community

Recommended Posts

got my N-1 oil pump yesterday and took it apart to compare to my std R32 GTR oil pump...(2 screws worked loose as they do )

here are the differences for interest sake:

1: the relief spring

std has a twin spring system N-1 has a single...both measured identical spring rates at 3 different heights starting from the installed height.

Interestingly the N-1 relief plunger has a small oil hole drilling about 8mm down from the top edge, level with the relief oil passage in the pump housing. This would have a dampening effect on the way the relief valve works as the spring cavity would have a head of oil in it that would have to squeeze out the small oil drilling first.

Plunger size was the same and relief valve cavity was the same.

2: the oil pump gears are where the biggest difference lies.

The N-1 inner gear has 1 less lobe (11) vs the std which has 12...this allows the internal volume of the pump gears to increase using a redesigned shape on the outer gear/inner gear meeting surfaces. We didn't CC the difference as the N-1 was obviously much larger than the Std R32 gear.

3: The gear hardness and material...

a hardness test was performed using a proper hardness tester in the machine shop. The std gears were a 0.56 and the N-1 scored a 0.96 a marked difference!

Also the gears were made out of the same material!! Sintered steel.

The major reason , I believe , that the N-1 gears have been hardened is that in order to increase the pumping volume the outer gear wall thickness has been dramatically reduced thus hardening is required to keep the strength up.

4:Internal channels are all larger in the pump housing and redesigned to increase flow

5: the pump backing plate has a redesigned screw fixing arrangment with an extra screw on the N-1 ( 8 screws vs 7 in the std ) Also the backing plate is 0.5mm thicker ( 6.5mm on the N-1 vs 6mm on the std )

A note worth noting :D the backing plate screws were not lock tighted, needless to say that they where during reassembly!!!

Cheers Mike

Link to comment
https://www.sau.com.au/forums/topic/75069-n-1-vs-std-oil-pump/
Share on other sites

Good stuff. I had been led to believe the N1 was just a higher spring rate on the relief so it's good to see some testing.

What I have confirmed from FAST is that the RB25DET and RB26DETT oil pumps flow exactly the same amount, but it doesn't detail any defferences in construction, so to all intents it is the same pump. I can't recall if the part number was different.

$850 NZ.

The Rb25 and the R32 GTR pump are indeed the same. We also happened to have one off a dead Rb25 and compared the two.

Interesting how the relief spring have the same spring rates eh?

Isn't the HKS pump worth a small fortune ??

Mike

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
    • I've managed to find this: Nissan_Stagea_AutechVersion260RS (1).pdf
    • I believe @Duncan has given it a crack at Mt Buller before (in actual race conditions)
    • All my Polish car culture insight comes from watching Nightride. So I half expect this to get 1UZ swapped eventually?! Are you going to drive it in winter? I'm always curious how ATTESA would hold up in the snow. There isn't that much opportunity to try it in Australia.  
    • My steering lock unit on my Infiniti G37 has failed. The car is a local 2012 Infiniti G37 (Q60 ) I need to replace the unit My local mechanic said i need to buy a complete steering wheel assembly. Does anybody no any mechanics in Gold Coast or Brisbane who can fix this issue or where i can buy just the Steering lock control unit. Thanks
×
×
  • Create New...